Enable Incognito CCT by default.

This feature is now used in Offline pages and Reader Mode.

Bug: 1023759
Change-Id: I7fe1ce7de0db04eee8ec313f5ef02443e7ce6ee4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529097Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Side Yilmaz <sideyilmaz@google.com>
Reviewed-by: Rohit Agarwal <roagarwal@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827164}

chrome/browser/flag-metadata.json

@@ -448,7 +448,7 @@
   {
     "name": "cct-incognito",
     "owners": [ "rhalavati", "//chrome/android/java/src/org/chromium/chrome/browser/customtabs/OWNERS" ],
-    "expiry_milestone": 88
+    "expiry_milestone": 93
   },
   {
     "name": "cdm-factory-daemon",

chrome/browser/flags/android/chrome_feature_list.cc

@@ -356,7 +356,7 @@ const base::Feature kCCTExternalLinkHandling{"CCTExternalLinkHandling",
                                              base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kCCTIncognito{"CCTIncognito",
-                                  base::FEATURE_DISABLED_BY_DEFAULT};
+                                  base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kCCTPostMessageAPI{"CCTPostMessageAPI",
                                        base::FEATURE_ENABLED_BY_DEFAULT};